Modification - Denon DVD-2900, DVD Audio/Video, Super Audio CD & CD Player

Product description from Denon: (full description)
The DVD-2900 is endowed with PureProgressive technology to unleash the full impact of DVD-Video picture quality. The DVD-2900 also uses a 12-bit, 108-MHz video D/A converter to faithfully preserve the delicate low-level signals often lost during D/A conversion. With these advanced video image technologies, the DVD-2900 will reproduce with the highest resolution, DVD images on Progressive-compliant monitors and projectors. For sound, it is high quality audio D/A conversion and Digital Bass Management that will bring out the best of not only Super Audio CD and DVD-Audio discs, but your entire CD collection as well.

Figure 1: My Denon DVD-2900 multi player machine

Inspired by other people I wanted to give modification of my Denon DVD-2900 a try. As I mainly use the player for audio I will only focus the modifications on the audio part in the following. So far a new clock and an analogue output buffer/filter has been added.

Sources of inspiration:
I have used the following sources as inspiration for modification of my Denon DVD-2900.... forum forum
Exemplar Audio modified Denon DVD-2900 Review 1
Exemplar Audio modified Denon DVD-2900 Review 2
SACDmods modified Denon DVD-2900
Audiocom modified Denon DVD-2900 Dexa (Lars Clausen), manufacturer of d-clock LC Audio (former Lars Clausen), manufacturer of ZapFilter

First modification:
It all started with Lars Clausen (Dexa/NewClassD) offering a "summer vacation upgrade" consisting of a d-clock and replacement of the opamps in the audio stage at a very fair price. The following components were were thus installed D-Clock, different opamps and capacitors in the signal path were replaced/removed.

Figure 2: The d-clock

The d-clock is a High End Audio Reference Clocks for upgrading of CD players, DVD players, SACD players, Computer Soundcards, etc.

DEXA "NewClassD" D-Clock Precision Master Clock Generator--This is a new clock design by Lars Clausen, formerly of LC Audio. Accuracy is rated at +/-1ppm of rated frequency and the new clock generates a true square wave output. The D-Clock has a unique microtransformer coupled output that eliminates ground loops in the clock circuitry. This clock measures and sounds superior to the LClock XO3. Clock modifications make any CD player sound remarkably smoother and more detailed. Most notably, you may find yourself able to sit and listen for hours at a time when you may have become tired of listening to more than a few albums previously.

Specifications: (see for more details)
- Accuracy: +/- 1ppm
- Jitter: 1.5pS
- Df(9-24V): Max 1Hz
- Control Functions: Host Vcc
- Power Supply Requirements: 9.00 - 24.00 Volts DC 20 mA

I must admit that I did not notice much change after this modification

Second modification:
Zapfilter were bought used at

Audio section:

Figure 3: Some components were removed and pins were added to interface with the DAC output

The dac output is too high and the Iref resistor needs to be changed:
(Hint was given by a user at

Figure 4: The resistor that needs to be changed

Figure 5: The new resistor

Diagram of the components that should be removed

A relay to turn the zapfilter off when player is in standby or turned off using the on/off power button in the front
can either be a 12 og 24 volts relay. I used a 24 volts relay.

Figure 6: Zap filter power supply and 24 Volts relay

Figure 7: Inside of the Denon DVD-2900 multi player machine

The negative:
Small clicks